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[P1,P2] = <a href="%pathto:plotop.vl_clicksegment;">VL_CLICKSEGMENT</a>() lets the user select a segment in the
current figure and returns the starting and ending point P1 and P2.
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The user can abort the operation by pressing any key. In this case
the function returns the empty matrix.
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See also: <a href="%pathto:plotop.vl_click;">VL_CLICK</a>(), <a href="%pathto:plotop.vl_clickpoint;">VL_CLICKPOINT</a>(), <a href="%pathto:vl_help;">VL_HELP</a>().
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